JPH057244A - Private branch exchange system - Google Patents

Abstract

PURPOSE:To provide a private branch exchange system which can know the present condition information of an automatic call distribution(ACD) group on real time. CONSTITUTION:In a private branch exchange system having an ACD function, plural keys K and a display lamp L provided in correspondence to the key are contained, respective keys K are allotted to respective extension telephone terminal correspondences 1a-1n, the keys are operated, and thus, a DSS console 1m which can call the extension telephone terminal of the key correspondence directly is used at the monitoring terminal for a supervisor, and to a central processing unit 6 of a private branch exchange, a function to control to display the condition of each extension telephone terminal to the terminal by the flickering period and the light emitting color to the key displaying lamp correspondence on the DSS console to allot to the terminal is added, and the condition of each extension telephone terminal is displayed in the light emitting condition at the key display lamp on the DSS console.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange system having an automatic call distribution (ACD) function.

[0002]

2. Description of the Related Art Private branch exchange systems have come to use microcomputers as the center of control, and have become more and more intelligent, and accordingly various functions have been provided. One of them is automatic call distribution (AC
(D)) function.

The ACD function is used for telephone numbers where incoming calls concentrate, such as a ticket reservation center and a mail-order reception desk. A large number of incoming calls to a specific telephone number assigned to a ticket reservation center or a mail-order reception desk, etc.
It is a function to connect evenly between the receptionists of the ACD group reception desk) according to a predetermined call distribution system.

If there is no reception person who can handle the incoming call in the group, the reception person who can connect the call to the recording announcement device or the music sound source and put on hold the call can be connected. Once on hold, the held call can be connected.

The ACD function is used for the number of incoming calls and the number of incoming calls for each ACD group and each reception desk every day or every hour.
Statistics such as average delay time, average call time, and number of calls abandoned can be accumulated and output as a report.From this statistical information, shift work, increase of staff, addition of lines etc. of the receptionist can be decided. AC by the supervisor, such as
Can manage and supervise the work of D group.

[0006]

As described above, the ACD function is a function for equally connecting a large number of incoming calls to a specific telephone number among the recipients of the ACD group according to a predetermined call distribution system. In addition, the number of incoming calls and the number of answering calls for each ACD group and each reception desk every day or each time period,
It is a function that can obtain various statistical information such as average delay time, average call time, number of calls abandoned midway.

However, even if the conventional method can obtain the statistical information, this is only the resulting statistical information, and there is no means for the supervisor to know the real-time information of the ACD group managed by the supervisor in real time. However, it was not possible to grasp the congestion situation and the processing situation in real time, and to properly give business instructions such as increasing the number of ACD group receptionists and changing the arrangement, and reducing the number of people when there was no congestion.

[0008] Therefore, there is an inconvenience that the receptionist becomes uncomfortable because he or she is unable to maintain a proper working state such as an abnormally busy situation or conversely too much leisure time.
In addition, it is difficult for users to get through the phone, etc.
There is a problem in terms of service. However, such a situation is a problem that can be dealt with as much as possible if the current situation information of the ACD group can be known in real time.

Therefore, the object of the present invention is to
Provides a private branch exchange system that enables real-time information on the current status of the ACD group, provides appropriate business instructions in accordance with the situation, enables proper receptionist management, and improves services. To do.

[0010]

In order to achieve the above object, the present invention is configured as follows. That is, it is an exchange that accommodates an extension line and an extension line, and among the accommodated extension lines, incoming calls from the extension line with a predetermined telephone number are evenly distributed to a plurality of extension telephone terminals that are defined as reception of a plurality of extension telephone terminals. In a private branch exchange system having an automatic call distribution (ACD) function, which is an incoming call control function for receiving an incoming call, firstly, for each extension telephone terminal, the status information of the terminal can be recognized so that the status type can be recognized. Display means for displaying, recognizing means for recognizing the current state of each extension telephone terminal, and status type recognizable display output corresponding to the present state recognized by this recognizing means are generated for the extension telephone terminal. And a display control means provided to the display means.

Secondly, a plurality of keys and key display lamps provided corresponding to these keys are provided. The key display lamps use elements capable of emitting multicolor light, and each key display lamp is controlled by a control signal. Lighting control is possible, by assigning each key to each extension telephone terminal and operating that key, the extension telephone terminal corresponding to the key can be called directly, and at least each extension of the reception desk A first storage means for storing the setting information of the color of the display lamp and the blinking cycle indicating the current state of the telephone terminal;
The second storage means for storing the extension number of the extension telephone terminal of each reception corresponding to the key number on the console and the storage content of the first storage means when the state of the extension telephone terminal of the reception changes And a control means for sending a light emission control command of the key display lamp corresponding to the extension telephone terminal whose state has been changed to the DSS console.

[0012]

In the above construction, in the case of the first construction, there is a display means for displaying the status information of the terminal corresponding to each extension telephone terminal so that the status type can be recognized as a supervisor monitor. The means recognizes the current state of each extension telephone terminal, and the display control means generates a display output capable of recognizing the state type corresponding to the present state recognized by the recognition means and gives it to the display means. . The current status is information such as reception work completion, reception work end, talking, waiting for incoming call, etc. At least the current state of each extension telephone terminal for reception is displayed on the display means in a display state according to these information. , It becomes possible to provide the ACD group supervisor with real-time information about the current status of each of the managed recipients.

Further, in the case of the second configuration, a DSS console having a key corresponding to each extension and a key display lamp corresponding to the key is used, and the control means, when the state of the extension telephone terminal of the reception changes, By referring to the stored contents of the first storage means and sending a light emission control command of the key display lamp corresponding to the extension telephone terminal whose state has changed to the DSS console, the current state of the extension telephone terminal of each reception is D
Display on the key display lamp on the SS console. The current status is information such as reception work completion, reception end work, talking, waiting for incoming call, etc., and a display state according to these information is displayed in a form that at least the current state of each extension telephone terminal for reception can be understood. Since it is created, it becomes possible to provide the supervisor of the ACD group with information on the current status of each of the recipients to be managed in real time.

Therefore, according to the present invention, it is possible to know the current status information of the ACD group in real time, and it is possible to give a proper business instruction in accordance with the situation. A private branch exchange system capable of improving services can be provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the overall configuration showing an embodiment of the present invention. In FIG. 1, 1a to 1n are key telephones, respectively, and a plurality of these key telephones 1a
1n are connected to the communication path network (SW) 3 via line circuits (LC) 2a to 2n, respectively.

The key telephones 1a to 1n are telephone terminals and have a handset 11, a dial keypad 13, a function key 14, etc., as shown in FIG.
The function key 14 is used as various function keys, and the log key (log
key) 14a is provided, and this log key 14a
By pressing, the central processing unit (CC) of the exchange
6 can be notified of the start / end of his / her work.

Further, the communication path network 3 is used for switching connection between extension lines or between extension lines to external lines (station lines), and from external lines to internal lines.
K) to the local line via 4a to 4n, and to the line circuit (L
C) It is connected to the extension line via 2a to 2n.

The line circuits (LC) 2a to 2n are connection interfaces provided for each extension and serve as a connection interface between the communication path network 6 and each extension telephone. The office line trunk circuits 4a to 4n, which are subscriber circuits, are circuits that interface with the call path network 6 and the corresponding office lines, and also perform incoming call detection, DC loop closure for line capture, and the like. In addition, the line circuits 2a-2
n and the central line trunk circuits 4a to 4n are the central processing unit 6
The central processing unit 6 can detect status information such as outgoing call, incoming call, end call, busy, and recovery.

As described above, the communication path network 3, the line circuits (LC) 2a to 2n and the office line trunk circuit 4a.
4n are connected to the central processing unit (CC) 6 via the control data bus line 5 and use the data stored in the storage device (MEM) 7 between the key telephones 1a to 1n and via the communication path network 3. It is configured to form a communication path between the key telephones 1a to 1n and the office line.

1 m is a DSS (Direct Station Selection) console, which has a plurality of keys and an indicator lamp (eg, LED;
It has a light emitting diode) and is usually used in combination with an electronic key telephone. One of the telephone numbers of extension telephones in the system is assigned in advance to a plurality of keys on the DSS console 1m, and if the corresponding lamps are lit, it means that the telephone is in use. The state of the extension telephone can be known by the lighting state of the key display lamp, such as showing that it is unused when it is off. If the display lamp is off, the key telephone handset is off-hook and the key of the DSS console 1m is pressed to call the extension corresponding to the key with a single key operation.

As described above, the DSS console 1m is connected to the private branch exchange together with the key telephone device and is used instead of the relay stand. The display lamps (key display lamps L) and the switches (keys K) corresponding to the respective extension lines are provided. ), The state of the extension being used can be seen at a glance, and the key corresponding to the extension can be pressed to call the extension. In this system, the key display lamp L uses a light emitting element capable of emitting light in a plurality of colors such as at least red and green.

FIG. 3 shows the appearance of the DSS console 1m. This DSS console 1m shows an example of 60 keys K, and these 60 keys K have # 1 to # 6 in order.
Numbers up to 0 are assigned, and the extension numbers are assigned in a one-to-one correspondence with the extension numbers, and the assignment information is stored in the storage device 7 of the key telephone main unit or the private branch exchange to which the DSS console 1m is connected.

When the handset of the reception key telephone is off-hook, the key telephone main unit or the storage device of the private branch exchange waits for dial reception. In this state, the keys # 1 to # 60 of the DSS console 1m are pressed. When the key of the number corresponding to the extension to be called out of K is pressed, the key telephone main unit or the private branch exchange seeks a registered extension corresponding to the key, sends a ringing tone to the extension, and at the stage where the terminal responds. Make a call. Also, for the extension which is being used, the line L corresponding to the extension is turned on to inform that it is being used. Such processing is managed and executed by software by the central processing unit 6 which is the control center of the key telephone main unit and the private branch exchange.

As shown in FIG. 2, the key telephones 1a to 1n are, for example, the handset 11 and the hook mechanism 1 thereof.
2, dial mechanism 13, various service key buttons 14, log key for starting / ending the reception work 1
4a etc. are provided. Then, if the log key 14a is pressed in the log-out state, it becomes log-in and is registered as a reception desk, and if the log key 14a is pressed in the log-in state, it is logged out and registration as a reception desk is peripheral. To be done.

That is, each of the key telephones 1a to 1n is registered in a specific ACD group in advance, and if registered for log out, it is removed from the ACD group and registered for log in. AC
The private branch exchange functions so as to be processed as the terminal of the reception desk of the D group.

The private branch exchanges are key telephones 1a to 1
The state of n is managed and controlled so that it can be displayed by the lamp emission color, blinking period, etc., by using the key display lamp corresponding to the key telephone 1a to 1n allocation extension on the DSS console 1m. These functions are also realized by software by the central processing unit 6 of the private branch exchange. The operation of this system having such a configuration will be described. First, the case of dialing from the key telephone 1a will be described.

When the key telephone 1a makes a call, this call information is transmitted to the central processing unit 6 via the line circuit 2a. Then, the central processing unit 6 sends a dial tone to the key telephone 1a when the call path network (SW) 3 is in a circuit connectable state in response to the call information, and notifies that it is in a dialable state. Notify the user of the call key telephone 1a.

The dial information given from the key telephone (EKT) 1a after confirming the dial tone is likewise given to the central processing unit 6 via the line circuit 2a, and the central processing unit 6 receives the dial information. When the required number of digits is received, it is determined whether the extension interconnection or the station line connection is established. Then, when the dial destination is an extension, it is checked whether or not the destination address is free. When it is available, a ringing tone is sent to the destination terminal and a ringback tone is sent to the caller side. When the other party goes off-hook, the call becomes possible.

If the dial information is a station line connection, that is, if it is outside line (station line) transmission command information (special number "0", etc.) to the private branch exchange, the central processing unit. 6 is one of the trunk circuits 4a to 4n,
Select an empty trunk circuit and connect the calling terminal to the empty trunk circuit. Then, the central processing unit 6 operates so as to send the dial information by the subsequent dial operation to the connected trunk circuit.
By being connected to the vacant trunk circuit, a dial tone is sent to the calling key telephone 1a from the side of the central office to inform the calling key telephone 1a that dial operation is possible.

Therefore, when the user of the calling key telephone 1a that has heard this dials the other party's number, this operation dial information is sent to the central exchange, and a ringing tone is sent to the other party corresponding to the dial information. Along with
A ringback tone is sent to the caller side. When the other party goes off-hook, the call becomes possible. On the other hand, it operates as follows for an incoming call.

The DSS console 1m in this system
The state display operation of the recipient using the key display lamp L (state display operation of the terminal used by the recipient) will be described with reference to FIGS. 3 to 8.

The DSS console 1m is, so to speak, a terminal having only the service key button of an electronic key telephone, and like the electronic key telephone, is connected to the central processing unit 6 via the control data bus line 5 through the line circuit (LC) 2m. Connected. Since the DSS console 1m is not a communication terminal, it is not connected to the speech path network 3.

FIG. 8A is a control information table M for storing the lighting type information of the key display lamp L for displaying the information of the recipient in correspondence with the status of the recipient (corresponding to the status of the terminal used by the recipient).
EMT1 and MEMT2, which are formed on the storage device 7. The control information table MEMTI is the color designation information of the key display lamp L, for example, "0" for red display,
"1" is set for green display.

The control information table MEMT2 is a table of blinking cycle designation information. Dark (Dark) is "0", Study On (Steady On) is "1", Use (I.use) is "2", and wink. (Wink) is “3”, Flash
Is "4".

The status of the terminal of the recipient is business end (log out)
, Waiting for an incoming call, receiving an incoming call, and being in a call, for example, they are distinguished by numbers (0 to 3). In other words, set "0" when the recipient's terminal status is "log out", "1" when waiting for an incoming call, "2" when an incoming call is in progress, and "3" when a call is in progress. To be done.

Control information tables MEMT1 and MEMT2
Corresponds to this number, MEMT1 stores the emission color of the key display lamp L, and MEMT2 stores the blinking cycle information of the key display lamp L. These settings are made by work setting (setting at the time of production or installation), and can be freely set depending on the usability of the user.

FIG. 8B is a table MEM3 storing the terminal state of the receiver, and the extension number D of the terminal of the receiver.
The current state of the terminal of the recipient is set and registered for N correspondence. Further, FIG. 8C is a table MEMT4 storing the key assignment information of the DSS console 1m.
The extension number DN of the receiver terminal assigned to the key K is stored in correspondence with the key numbers # 1 to # 60 of the S console 1m.

Now, assuming that the key telephone 1a is used as a telephone for the reception work of a certain receptionist (the above-mentioned receptionist terminal), the log key (log key (log key) 14a is pressed (Fig. 4
S401).

This key press information is transmitted to the central processing unit 6 via the line circuit 1a, and based on this, the central processing unit 6 uses the extension number DN (Directory) of the terminal used by the recipient who pressed the log key 14a. Number; based on the extension number of the terminal or the assigned input / output port number of the terminal), the terminal status of the recipient is checked from the table MEMT3 (FIG. 8B) (S402 in FIG. 4).

Then, the central processing unit 6 judges whether or not the terminal state of the recipient is business end (logout; business end of the recipient) (S403 in FIG. 4), and as a result of the judgment, registration of business end If the status is "0", the central processing unit 6 rewrites the content corresponding to the extension number DN of the terminal used by the recipient in the recipient status table MEMT3 to the "waiting for incoming call" status "1" (S404 in FIG. 4). , Receptionist terminal (key telephone 1
Log-in processing for making a) possible for receiving an incoming call is performed (S405 in FIG. 4).

After this, the central processing unit 6 uses the table MEM.
The key display lamp lighting type (light emission color and blinking cycle) in the "waiting for incoming call" state is obtained from T1 and MEMT2 (S40 in FIG. 4).
9) Find the key number to which the corresponding DN of the terminal used by the recipient on the DSS console 1m is assigned from the table MEMT4 (S410 in FIG. 4), and command the DSS console 1m for the key display lamp corresponding to that key number. (Emitting color and blinking cycle) is transmitted (S411 in FIG. 4).

If the recipient's terminal is not in the "work end" state "0", it is checked whether the terminal is in the "waiting for incoming call" state "1" (S406 in FIG. 4), and in the "waiting for incoming call" state. If there is, the central processing unit 6 rewrites the table registration contents of the area corresponding to the DN of the terminal used by the recipient of the table MEMT4 to the “business end” state “0” (S407 in FIG. 4), and the business of the terminal of the recipient. A log out process is performed (S408 in FIG. 4). After that, the central processing unit 6 performs the same processing as the above processing (S411 in FIG. 4). Next, the case where the call is received by the recipient will be described.

When there is an incoming call from a station line to a certain station line trunk circuit (TRK) 4a (S501 in FIG. 5), the central processing unit 6 determines whether the destination of this station line trunk circuit 4a is the ACD group. Check (S502 in FIG. 5). When the central processing unit 6 determines that the destination is the ACD group,
According to the distribution method defined among the recipients belonging to the ACD group, the recipient's terminal that can receive the call is searched (see FIG. 5).
S503).

When the central processing unit 6 finds the terminal of the recipient who can receive the call, the setting content corresponding to the extension number DN of the terminal of the recipient who can receive the call in the table MEMT3 is rewritten to the incoming state (S505 in FIG. 5). ), ACD incoming call processing is performed (S506 in FIG. 5). After this, the central processing unit 6 uses the table MEM.
The key display lamp lighting type indicating the "incoming call" state is obtained from T1 and MEMT2 (S507 in FIG. 5), and the table MEMT is displayed.
The key number of the DSS console 1m to which the extension DN of the recipient who received the call is assigned is obtained from S4 (S508 in FIG. 5), and the key to the key display lamp L corresponding to the key number is pressed for the DSS console 1m. The display lamp control command is sent (S509 in FIG. 5).

When the recipient performs a response operation (S601 in FIG. 6),
The central processing unit 6 rewrites the setting content of the position corresponding to the extension DN of the respondent on the table MEM3 to the "busy" state (S602 in FIG. 6) and performs the extension response process (S604 in FIG. 6). ).

After this, the central processing unit 6 uses the table MEM.
The key display lamp lighting type indicating the "in-call" state is obtained from T1 and MEMT2 (S604 in FIG. 6), and the table MEMT is displayed.
4. Obtain the key number to which the extension DN of the responding person on the DSS console 1m is assigned from 4 (see FIG. 6).
S605), the key display lamp control command for the key display lamp L corresponding to the key number is sent to the DSS console 1m (S606 in FIG. 6).

When the receiver's terminal (key telephone 1a) is restored (S701 in FIG. 7), the central processing unit 6 displays the table ME.
The setting contents of the position corresponding to the extension number DN of the terminal of the restored recipient on the MT3 are rewritten to the "waiting for incoming call" state (S702 in FIG. 7), and the extension restoration process is performed (S703 in FIG. 7). After this, the central processing unit 6 uses the tables MEMT1 and MEMT2.
The key display lamp lighting type indicating the “waiting for incoming call” is obtained (S705 in FIG. 7), and the key display lamp control command for the key display lamp L corresponding to the extension DN of the recipient terminal is sent to the DSS console 1m. Yes (of Figure 7
S706).

By this series of control, the key display lamp L corresponding to the assigned key number of each acceptor's terminal is displayed and controlled in the display form showing the respective states, and as a result, the supervisor displays DSS. It is possible to instantly know the current state of each acceptor terminal by the display form of each display lamp of the console 1m. The extension number DN of the terminal used by each acceptor can be assigned to the key on the DSS console 1m by the work order setting.

As described above, this system stores information for determining the lighting color and blinking cycle of the display lamp in the memory table MEM so that the situation can be identified according to the state of the extension telephone terminal of the recipient.
1, MEMT2 (FIG. 8 (a)) is registered, and when the state of the extension telephone terminal of the recipient changes due to the call processing operation,
The lighting type of the indicator lamp corresponding to the new state is obtained from the memory tables MEMT1 and MEMT2, and the memory table MEM4 of the allocation information indicating which recipient's terminal is allocated to the key on the DSS console.
From FIG. 8C, a key number corresponding to the terminal of the recipient whose state has changed is obtained, and a light emission control command for controlling the light emission color and blinking cycle of the key display lamp of the key number is issued to the DSS console. The status of the receiver's terminal can be displayed and monitored by the key display lamp on the DSS console.

Further, according to the present invention, when the state of the terminal of the recipient changes with respect to the DSS console which is the monitor terminal for the supervisor, the emission color of the display lamp on the DSS console corresponding to the terminal of the recipient is changed. By changing the blinking cycle according to the status, it is possible to display in real time so that the recipient's current status can be understood in detail, so that the supervisor can manage the ACD group You will be able to provide information that will help you understand the current situation.

As described above, this system has a plurality of keys and an indicator lamp provided in correspondence with the keys in the private branch exchange having the ACD function. By assigning each key to each terminal and operating the key. The DSS console that can directly call the terminal corresponding to the key is used as the monitor terminal for the supervisor, and the central processing unit of the private branch exchange assigns the status of each terminal to the terminal on the DSS console. The status of each terminal can be displayed by adding the function to control to display with the blinking cycle and the color of light emission corresponding to the key display lamp.
Since the key display lamp on the SS console is displayed in a light emitting state, it is possible to instantly know the current state of each reception terminal.

The present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention. DSS as a monitor device for supervisors
Although the console was used, a display device provided with only a lamp for displaying the state corresponding to each extension can also be used. In addition to the lamp display, a color display such as a color CRT or a color liquid crystal display can be used. It is also possible to use a method of displaying a symbol by changing the color or blinking cycle for each extension and displaying the status, or a method of displaying the status by a character display. It is also possible to use a monochrome display instead of a color display to display the status by changing the gradation or blinking cycle of the symbols for each extension, or to display the status by character display. .

[0054]

As described above in detail, according to the present invention, the present state of each extension telephone terminal for reception is notified by a display mode such as a light emission mode of the key display lamp on the DSS console. By doing so, it is possible to instantly know the current state of each receptionist terminal, and to the supervisor,
It is possible to provide ACD group information in real time, it is possible to deploy appropriate receptionists, and it is possible to reduce waiting time for callers. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a diagram showing an appearance of a key telephone used in the present invention.

FIG. 3 is a diagram showing an appearance of a DSS console used in the present invention.

FIG. 4 is a flowchart for explaining an operation example of the present invention.

FIG. 5 is a flowchart for explaining an operation example of the present invention.

FIG. 6 is a flowchart for explaining an operation example of the present invention.

FIG. 7 is a flowchart for explaining an operation example of the present invention.

FIG. 8 is a diagram showing an example of various tables used in the present invention.

[Explanation of symbols]

1a to 1n ... key telephone, 1m ... DSS console,
2a to 2n ... Line circuit (LC), 3 ... Speech path network (SW), 4a-4n ... Station line trunk circuit (TR)
K), 5 ... Control data bus line, 6 ... Central processing unit (CC), 7 ... Storage device (MEM), 11 ... Handset, 13 ... Dial keypad, 14 ... Function key, 14a ... Log key (log key) ), K ... key, L ...
Key display lamp.

Claims (3)

[Claims] 1. An exchange that accommodates an internal line and an external line,
Automatic call distribution, which is an incoming call control function that evenly receives incoming calls from outside lines with a predetermined telephone number among the accommodated outside lines to a plurality of extension phone terminals defined as reception among a plurality of extension phone terminals In a private branch exchange system having an option (ACD) function, display means for displaying the status information of each extension telephone terminal so that the state type can be recognized, and at least the current extension telephone terminals It comprises a recognition means for recognizing the state, and a display control means for generating a display output capable of recognizing the state type corresponding to the present state recognized by the recognition means for the extension telephone terminal and giving it to the display means. Private branch exchange system. 2. An exchange that accommodates an internal line and an external line,
Automatic call distribution, which is an incoming call control function that evenly receives incoming calls from outside lines with a predetermined telephone number among the accommodated outside lines to a plurality of extension phone terminals defined as reception among a plurality of extension phone terminals In a private branch exchange system having an option (ACD) function, a plurality of keys and a key display lamp provided corresponding to these keys are used. The key display lamp uses an element capable of emitting multiple colors and each key display lamp. Can control lighting by a control signal, and by assigning each key corresponding to each extension telephone terminal and operating the key, the extension telephone terminal corresponding to the key can be directly called, and at least a DSS console. Stores the setting information of the color and blinking cycle of the indicator lamp showing the current state of each extension telephone terminal at the reception
Storage means, second storage means for storing the extension number of each extension telephone terminal of each reception corresponding to the key number on the DSS console, and when the state of the reception extension telephone terminal changes,
A private exchange characterized in that it is provided with a control means for sending to the DSS console a light emission control command for a key display lamp corresponding to the extension telephone terminal whose state has changed by referring to the stored contents of the first storage means. system. 3. The private branch exchange system according to claim 1 or 2, wherein the current status is information such as reception work completion, reception work end, talking, waiting for an incoming call.